<template>
  <el-container class="home-container">
    <el-header>
      <div>
          <img src="../assets/heima.png">
          <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="loginOut">退出</el-button>
    </el-header>
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse" >|||</div>
        <!-- unique-opened:是否只保持一个子菜单的展开
             collapse:是否水平折叠收起菜单（仅在 mode 为 vertical 时可用）-->
        <el-menu :collapse="isCollapse" background-color="#333744" 
        text-color="#fff" active-text-color="#409eff" unique-opened
        :collapse-transition="false" router
        :default-active="activePath">
      <!-- 一级菜单 -->
      <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
          <!-- 一级菜单模板区域 -->
        <template slot="title">
            <!-- 图标 -->
          <i :class="iconsObj[item.id]"></i>
          <!-- 文本 -->
          <span>{{item.authName}}</span>
        </template>
        <!-- 二级菜单 -->
        <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" 
        :key="subItem.id" @click="saveNavState('/'+subItem.path)">
               <!-- 图标 -->
          <i class="el-icon-menu"></i>
          <!-- 文本 -->
          <span>{{subItem.authName}}</span>
        </el-menu-item>
      </el-submenu>
      
    </el-menu>
      </el-aside>
      <!-- 右边主体部分 -->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>
<script>
export default {
  data () {
    return {
      //左侧菜单数据
      menulist:[],
      iconsObj:{
        '125':'iconfont icon-users',
        '103':'iconfont icon-tijikongjian',
        '101':'iconfont icon-shangpin',
        '102':'iconfont icon-danju',
        '145':'iconfont icon-baobiao'
      },
      //是否折叠
      isCollapse:false,
      //被激活的链接地址
      activePath:''
    }
  },
  created () {
    this.getMenuList();
    //从sessionStorage取出保存的链接地址值
    this.activePath=window.sessionStorage.getItem('activePath');
  },
  methods: {
    loginOut() {
      //清空保存在sessionStorage中token
      window.sessionStorage.clear();
      this.$router.push("/login");
    },
    //左侧菜单权限
    async getMenuList(){
      const{data:res}= await this.$http.get('menus')
      if(res.meta.status !== 200){
        return this.$message.error(res.meta.msg)
      }else{
        this.menulist = res.data
        
      }
    },
    toggleCollapse(){
      //点击按钮，切换菜单的折叠与展开
        this.isCollapse=!this.isCollapse
    },
    saveNavState(activePath){
      //保存链接的激活状态
      window.sessionStorage.setItem('activePath',activePath);
      this.activePath=activePath
    }
  },
};
</script>
<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0px;
  align-items: center;
  color: #fff;
  font-size: 20px;
  >div{
      display: flex;
      align-items: center;
      span{
          margin-left: 15px;
      }
  }
}
.el-aside {
  background-color: #333744;
}
.el-main {
  background-color: #eaedf1;
}
.iconfont{
  margin-right: 10px;
}
.el-menu{
  border: none;
}
.toggle-button{
  background-color:#4a5064 ;
  color: #fff;
  font-size: 10px;
  line-height: 24px;
  text-align: center;
  letter-spacing: 0.2rem;
  cursor: pointer;//鼠标改为小手
}
</style>